The generated C code is now in ANSI-C by default. If you want to support pre-ANSI-C compilers, you need to provide the option --language=C on the command line or %language=C in the source file.

The 'len' parameter of the hash function and of the lookup function is now of type 'size_t' instead of 'unsigned int'. This makes it safe to call these functions with strings of length > 4 GB, on 64-bit machines.